Children of King Uilliam I of Scotland .. by Mother
     
  Ermengarde de Beaumont, wife
--Margaret nic Uilliam (b.1193)
--Isabel nic Uilliam (b.1195)
--Alexander II mac Uilliam, king of Scotland (b. 1198)
--Marjorie nic Uilliam (b.1204)

(unknown mistresses), wife
--Simon de Kynneer
--Marjory nic Uilliam (b.1165)
--Matilda nic Uilliam (b.1203)

Isabel d'Avenel, (mistress)
--(daughter) nic Uilliam (b.1162)
--Ada nic Uilliam (b.1164)
--Robert de Lundin nic Uilliam (b.1167)
--Henry de Galightey mac Uilliam (b.1169)
--Isabel nic Uilliam (b.1170)
--Aufrica nic Uilliam

Margaret de Hythus (mistress)
--Margaret nic Uilliam (b.1170)